Weird audio glitch has suddently appeared in my podcast

Hi all,
I've been producing an audio podcast for over a year now and recently my audio recordings have developed an intermittent and random bug.
Have a listen to http://gamerdork.net/audiobug.mp3 if you will, please.
I use a Plantronics .625 USB headset to record. I also have a Plantronics 510 headset that also suffers the same bug at random times. I've tried using the headset in different USB ports on my iMac with the same bug rearing its head at random times.
Would someone be able to give me a hint to what might be causing this bug, please?

I can't give you a definitive answer. From your excerpt it sounds as if the fault is on the incoming sound from Skype, since there is an undistorted voice, presumably the local speaker, and we hear the Skype disconnection sound.
There are two faults. One is the fizzing noise and the distortion which renders it nearly unintelligible. This is typical of a ludicrously low sampling rate and/or bitrate. Skype isn't exactly hifi, but it doesn't use rates as low as this: however if the connection is poor then possibly it may auto-adapt and be overdoing it.
The other fault is the repetition. Sound coming through a digital system usually comes through a buffer, so that small delays in the incoming digital signal can be 'mopped up' and not audible. Most systems react to a longer break by blanking out: but I've heard cases where an interruption in a digital signal causes the buffer to repeat until it gets some more data.
So this points to a connection which is both very slow and liable to breaks of maybe half a second to a second. The next questions to ask are, does this happen on Skype incoming audio only, or have you ever heard it on audio coming from some other source? If it's Skype, does it happen with one particular contributor? Does he have a poor connection - dial-up, for example? - or possibly something causing a temporary problem?
Odd things do happen - sometimes my Skype connection will suffer interesting video breakup (I have fast broadband) and sometimes it's excellent. You may find the problem simply goes away, or it may be intermittent and due to uncontrollable internet vagaries. All you can do, if it recurs, is to try to isolate exactly where it is arising, noting what audio is affected and what isn't.

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